Math Help - Easy question about graphing a cos function

1. Easy question about graphing a cos function

How to graph y=(cos^2)(x)

i know there is a way to rewrite this function so i can plug it into my calculator to graph it but i dont remember how to rewrite it.

is it maybe something like y=2cosx or maybe y=cosx^2????

thank you

chad

2. Originally Posted by mybrohshi5
How to graph y=(cos^2)(x)

i know there is a way to rewrite this function so i can plug it into my calculator to graph it but i dont remember how to rewrite it.

is it maybe something like y=2cosx or maybe y=cosx^2????

thank you

chad
if using a TI, the correct syntax is ... $Y_1 = \cos(x)^2$

or use the power reduction identity ...

$\cos^2{x} = \frac{1+\cos(2x)}{2}$

3. Awesome. thank you =)